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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint746,952 companies indexed · Last updated: today
DirectoryCrafts & TradesPlumberZurichGebrüder Sulzer GmbH
Gebrüder Sulzer GmbH Logo
Verified· 3 sourcesTrust Score
Summary

About the company

Bunjaku Group GmbH provides services in heating, refrigeration, sanitary works, gas and water technology, and renewable energy. Services include planning, installation, maintenance and repair of systems, and a 24‑hour on‑call emergency service.

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Service area

Offering

Products & services

Industry:Plumber
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3.9/5

Gebrüder Sulzer GmbH

✓ Offered6
Plumbing
Plumbing installations, installation of sanitary systems and fittings, pipework service, maintenance and repair for apartments, commercial buildings and industrial facilities.
Water treatment systems
Installation and maintenance of water treatment systems, water softening systems, reverse osmosis systems, pumps, filters and swimming pool technology, as well as repairs.
Heating systems
Installation, maintenance and repair of heating systems and heating solutions for private, commercial and industrial applications.
Refrigeration technology
Planning, installation and maintenance of refrigeration systems for commercial, industrial and private households.
Gas heating
Installation of gas heating systems as well as maintenance and repair to ensure durability and efficiency.
On-call emergency service
24-hour emergency service with telephone support or on-site intervention for unexpected problems and breakdowns.
Trust & reputation

ranQ Trust Score of Gebrüder Sulzer GmbH: 3.9 out of 5.0

Trust Score3.9/ 5.0

High

x

Data basis 88% · As of November 2026

Gebrüder Sulzer GmbH scores 53.3 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.68.224%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.17.610%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
Gebrüder Sulzer GmbH scores 83.0 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.55.07%
Gebrüder Sulzer GmbH scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
Gebrüder Sulzer GmbH scores 0.6 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.0.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Gebrüder Sulzer GmbH reaches a ranQ Trust Score of 3.9 out of 5.0 — rated «High». The rating draws, among other things, on 5.0 out of 5 stars from 1 customer reviews. The data basis is 88%, so the score is backed by part of the criteria. As of November 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 1 reviews across all connected sources

Sources
GGoogle51
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Comparisons

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Location

Mühlackerstrasse 112
8046 Zurich
Opening hours
Mon
06:30 - 17:30
Tue
06:30 - 17:30
Wed
06:30 - 17:30
Thu
06:30 - 17:30
Fri
06:30 - 17:30
Sat
06:30 - 17:30
Sun
Closed

At a glance

Legal form
Limited Liability Company
UID
CHE-104.259.454
Founded
1998 · 28 years
Last commercial register change
October 29, 2026
Employees
1 to 10

Active in 1 of 26 cantons · 1 municipality

  • ZHZurich
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
88.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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